The Record of the Demon Seal with Gun and Dagger

"Have you ever seen your own corpse? I have seen more than four hundred of them!" "Have you ever faced those bizarre and terrifying creatures? I deal with them every day." "You ask what my job is? Oh, my job is to eliminate all irrational existences in human cognition." "How did I get this job, you ask? Well, because I was unlucky! I was chosen." The alternative fantasy life of an unlucky killer.